libjava/classpath/gnu/java/util/regex/RETokenEnd.java

   1 /* gnu/regexp/RETokenEnd.java
   2    Copyright (C) 2006 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.java.util.regex;
  40
  41 import gnu.java.lang.CPStringBuilder;
  42
  43 final class RETokenEnd extends REToken
  44 {
  45     /**
  46      * Indicates whether this token should match on a line break.
  47      */
  48   private String newline;
  49   private boolean check_java_line_terminators;
  50
  51   /**
  52    * Indicates whether this token is a real one generated at compile time,
  53    * or a fake one temporarily added by RE#getMatchImpl.
  54    */
  55   private boolean fake = false;
  56
  57     RETokenEnd (int subIndex, String newline)
  58   {
  59     super (subIndex);
  60     this.newline = newline;
  61     this.check_java_line_terminators = false;
  62   }
  63
  64   RETokenEnd (int subIndex, String newline, boolean b)
  65   {
  66     super (subIndex);
  67     this.newline = newline;
  68     this.check_java_line_terminators = b;
  69   }
  70
  71   void setFake (boolean fake)
  72   {
  73     this.fake = fake;
  74   }
  75
  76   int getMaximumLength ()
  77   {
  78     return 0;
  79   }
  80
  81   boolean match (CharIndexed input, REMatch mymatch)
  82   {
  83     if (!fake)
  84       return super.match (input, mymatch);
  85     return super.matchFake (input, mymatch);
  86   }
  87
  88   REMatch matchThis (CharIndexed input, REMatch mymatch)
  89   {
  90     char ch = input.charAt (mymatch.index);
  91     if (ch == CharIndexed.OUT_OF_BOUNDS)
  92       return ((mymatch.eflags & RE.REG_NOTEOL) > 0) ? null : mymatch;
  93     if (check_java_line_terminators)
  94       {
  95         if (ch == '\n')
  96           {
  97             char ch1 = input.charAt (mymatch.index - 1);
  98             if (ch1 == '\r')
  99               return null;
 100             return mymatch;
 101           }
 102         if (ch == '\r')
 103           return mymatch;
 104         if (ch == '\u0085')
 105           return mymatch;       // A next-line character
 106         if (ch == '\u2028')
 107           return mymatch;       // A line-separator character
 108         if (ch == '\u2029')
 109           return mymatch;       // A paragraph-separator character
 110         return null;
 111       }
 112     if (newline != null)
 113       {
 114         char z;
 115         int i = 0;              // position in newline
 116         do
 117           {
 118             z = newline.charAt (i);
 119             if (ch != z)
 120               return null;
 121             ++i;
 122             ch = input.charAt (mymatch.index + i);
 123           }
 124         while (i < newline.length ());
 125
 126         return mymatch;
 127       }
 128     return null;
 129   }
 130
 131   boolean returnsFixedLengthMatches ()
 132   {
 133     return true;
 134   }
 135
 136   int findFixedLengthMatches (CharIndexed input, REMatch mymatch, int max)
 137   {
 138     REMatch m = (REMatch) mymatch.clone ();
 139     REToken tk = (REToken) this.clone ();
 140     tk.chain (null);
 141     if (tk.match (input, m))
 142       return max;
 143     else
 144       return 0;
 145   }
 146
 147   void dump (CPStringBuilder os)
 148   {
 149     os.append ('$');
 150   }
 151 }